In a test, a small fan operates at a potential difference of 6.0 V and carries a steady current of 0.25 A for 80 s. A warning lamp is then operated at 10 V for 60 s.
What steady current in the warning lamp would transfer the same energy as the fan?
0.25 A0.25\ \mathrm{A}0.25 A
0.20 A0.20\ \mathrm{A}0.20 A
0.15 A0.15\ \mathrm{A}0.15 A
0.33 A0.33\ \mathrm{A}0.33 A
94 exam-style questions on Edexcel GCSE Physics 10.1 Circuits, charge and current, covering 10.1.1 Structure of the atom, 10.1.2 Circuit diagrams and symbols, 10.1.3 Series and parallel circuits, 10.1.4 Potential difference and voltmeters, 10.1.5 Energy transferred, charge and potential difference, and 10.1.6 Current, ammeters and charge flow. Each one has a worked solution and a mark scheme showing where the marks go.